merge InferShapeContext and OperatorContext (#3347)

* merge InferShapeContext and OperatorContext

* OperatorBase& instead of OperatorBase*

paddle/framework/operator.h

@@ -120,10 +120,10 @@ class OperatorBase {
   std::shared_ptr<std::unordered_map<std::string, int>> in_out_idxs_;
 };
 
-class OperatorContext {
+class InferShapeContext {
  public:
-  OperatorContext(const OperatorBase* op, const Scope& scope)
-      : op_(*op), scope_(scope) {}
+  InferShapeContext(const OperatorBase& op, const Scope& scope)
+      : op_(op), scope_(scope) {}
 
   size_t InputSize() const { return op_.inputs_.size(); }
 
@@ -234,12 +234,6 @@ class OperatorContext {
   const Scope& scope_;
 };
 
-class InferShapeContext : public OperatorContext {
- public:
-  InferShapeContext(const OperatorBase* op, const Scope& scope)
-      : OperatorContext(op, scope) {}
-};
-
 template <typename T>
 struct EigenDeviceConverter;
 
@@ -255,11 +249,11 @@ struct EigenDeviceConverter<platform::GPUPlace> {
 };
 #endif
 
-class ExecutionContext : public OperatorContext {
+class ExecutionContext : public InferShapeContext {
  public:
-  ExecutionContext(const OperatorBase* op, const Scope& scope,
+  ExecutionContext(const OperatorBase& op, const Scope& scope,
                    const platform::DeviceContext* device_context)
-      : OperatorContext(op, scope), device_context_(device_context) {}
+      : InferShapeContext(op, scope), device_context_(device_context) {}
 
   template <typename PlaceType,
             typename DeviceType =
@@ -311,13 +305,13 @@ class OperatorWithKernel : public OperatorBase {
       std::unordered_map<OpKernelKey, std::unique_ptr<OpKernel>, OpKernelHash>;
 
   void InferShape(const Scope& scope) const override {
-    InferShape(InferShapeContext(this, scope));
+    InferShape(InferShapeContext(*this, scope));
   }
 
   void Run(const Scope& scope,
            const platform::DeviceContext& dev_ctx) const final {
     auto& opKernel = AllOpKernels().at(type_).at(OpKernelKey(dev_ctx));
-    opKernel->Compute(ExecutionContext(this, scope, &dev_ctx));
+    opKernel->Compute(ExecutionContext(*this, scope, &dev_ctx));
   }
 
   static std::unordered_map<std::string /* op_type */, OpKernelMap>&